Raman crosstalk mitigation in a multi-wavelength system utilizing an optical equalizing signal modulated with composite bandwidth-limited data sources

Abstract

A network element comprising a phase matched or phase controlled interconnect configured to receive a data signal sample, a Raman equalization transmitter, and a Raman crosstalk equalization conditioning circuit configured to generate a Raman mitigation signal using the data signal sample to be transmitted by the Raman equalization transmitter. Included is a method comprising multiplexing incoherent data signals with a video signal and a Raman mitigation signal to be co-propagated on a single optical fiber, wherein the Raman mitigation signal is selected to destructively interfere with Raman crosstalk noise induced on the video signal. Also included is a system comprising a video signal component configured to transmit a video signal, data stream signal components configured to transmit a data stream signals, a Raman crosstalk equalization system configured to transmit a Raman mitigation signal, and an optical multiplexer configured to multiplex the signals for co-propagation onto a single transmission fiber.

What is claimed is: 
     
       1. An optical component comprising:
 an interconnect configured to receive a data signal sample, wherein the interconnect is a phase matched electrical interconnect; 
 a Raman crosstalk equalization conditioning circuit coupled to the interconnect and configured to generate a Raman mitigation signal using the data signal sample; 
 a Raman equalization optical transmitter coupled to the Raman crosstalk equalization conditioning circuit and configured to convert the Raman mitigation signal into an optical Raman mitigation signal and to transmit the optical Raman mitigation signal; and 
 an electrical signal combiner coupled to the Raman crosstalk equalization conditioning circuit and the Raman equalization optical transmitter such that the electrical signal combiner is positioned between the Raman crosstalk equalization conditioning circuit and the Raman equalization optical transmitter, 
 wherein the electrical signal combiner is configured to combine the Raman mitigation signal with at least one other Raman mitigation signal received from at least one other Raman crosstalk equalization conditioning circuit. 
 
     
     
       2. The optical component of  claim 1 , wherein the bandwidth of the data signal sample is from about 55 Megahertz (MHz) to about 250 MHz. 
     
     
       3. The optical component of  claim 1  further comprising a low pass filter coupled to the electrical signal combiner and the Raman equalization optical transmitter such that the low pass filter is positioned between the electrical signal combiner and the Raman equalization optical transmitter, wherein the low pass filter is configured to:
 limit the bandwidth of the Raman mitigation signal; and 
 forward the bandwidth limited Raman mitigation signal to the Raman equalization optical transmitter. 
 
     
     
       4. The optical component of  claim 1  further comprising a low pass filter coupled to the interconnect and the Raman crosstalk equalization conditioning circuit such that the low pass filter is positioned between the interconnect and the Raman crosstalk equalization conditioning circuit, wherein the low pass filter is configured to:
 limit the bandwidth of the data signal sample; and 
 forward the bandwidth limited data signal sample to the Raman crosstalk equalization conditioning circuit. 
 
     
     
       5. The optical component of  claim 4  further comprising an optical/electrical converter coupled to the interconnect and the low pass filter, wherein the optical/electrical converter is configured to:
 receive the optical data sample from the interconnect; and 
 convert the optical data sample signal into an electrical data sample signal, 
 wherein the interconnect is a phase controlled optical interconnect. 
 
     
     
       6. The optical component of  claim 1 , wherein generating the Raman mitigation signal using the data signal sample comprises configuring the Raman mitigation signal to destructively interfere with Raman crosstalk noise induced on a video signal when a data signal associated with the data signal sample is co-propagated with the video signal through a single optical fiber. 
     
     
       7. A method comprising:
 multiplexing a plurality of data signals with a video signal and a Raman mitigation signal; and 
 co-propagating the multiplexed signal on a single optical fiber, 
 wherein the Raman mitigation signal is selected to destructively interfere with Raman carrier to crosstalk noise induced on the video signal by the data signals. 
 
     
     
       8. The method of  claim 7 , wherein the data signals are incoherent data signals, and wherein the incoherent data signals do not come from a common source. 
     
     
       9. The method of  claim 7 , wherein the video signals and the data signals are analog signals. 
     
     
       10. The method of  claim 7 , wherein the video signals and the data signals are digital signals. 
     
     
       11. The method of  claim 7  further comprising generating the Raman mitigation signal by using a sample of each of the data signals. 
     
     
       12. The method of  claim 11 , wherein the samples, the Raman mitigation signal, or combinations thereof have bandwidth from about 250 Megahertz (MHz) to about 55 Mhz. 
     
     
       13. A system comprising:
 a video signal component configured to transmit a video signal; 
 a plurality of data stream signal components, wherein each data stream signal component is configured to transmit a data stream signal; 
 a Raman crosstalk equalization system configured to transmit a Raman mitigation signal; and 
 an optical multiplexer (MUX) configured to multiplex the video signal, the data stream signals, and the Raman mitigation signal onto a single transmission fiber. 
 
     
     
       14. The system of  claim 13 , wherein Raman crosstalk noise is induced on the video signal by the data stream signals, wherein the Raman crosstalk noise is mitigated by the Raman mitigation signal, and wherein the Raman crosstalk noise is mitigated using a single Raman equalizing laser. 
     
     
       15. The system of  claim 14 , wherein the data stream signal components are further configured to transmit the data stream signals at first powers, and wherein the Raman equalizing laser is configured to operate at a second power equal to about an average of the first powers. 
     
     
       16. The system of  claim 13 , wherein the Raman mitigation signal is generated based on bandwidth limited samples of each of the data stream signals. 
     
     
       17. The system of  claim 16 , wherein the samples, the Raman mitigation signal, or combinations thereof are bandwidth limited to about 250 Megahertz (MHz) to about 55 Mhz. 
     
     
       18. The system of  claim 13 , wherein the data stream signals are incoherent data stream signals.